A019538 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 2 |
| | | | | | | | | 1 | | 6 | | 6 |
| | | | | | | | 1 | | 14 | | 36 | | 24 |
| | | | | | | 1 | | 30 | | 150 | | 240 | | 120 |
| | | | | | 1 | | 62 | | 540 | | 1560 | | 1800 | | 720 |
| | | | | 1 | | 126 | | 1806 | | 8400 | | 16800 | | 15120 | | 5040 |
| | | | 1 | | 254 | | 5796 | | 40824 | | 126000 | | 191520 | | 141120 | | 40320 |
| | | 1 | | 510 | | 18150 | | 186480 | | 834120 | | 1905120 | | 2328480 | | 1451520 | | 362880 |
| | 1 | | 1022 | | 55980 | | 818520 | | 5103000 | | 16435440 | | 29635200 | | 30240000 | | 16329600 | | 3628800 |
|
A019538 as a square array
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| 2 | 6 | 14 | 30 | 62 | 126 | 254 | 510 | 1022
| 6 | 36 | 150 | 540 | 1806 | 5796 | 18150 | 55980
| 24 | 240 | 1560 | 8400 | 40824 | 186480 | 818520
| 120 | 1800 | 16800 | 126000 | 834120 | 5103000
| 720 | 15120 | 191520 | 1905120 | 16435440
| 5040 | 141120 | 2328480 | 29635200
| 40320 | 1451520 | 30240000
| 362880 | 16329600
| 3628800
|
A019538 as an upper right triangle
1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 2 | 6 | 14 | 30 | 62 | 126 | 254 | 510 | 1022
| | | 6 | 36 | 150 | 540 | 1806 | 5796 | 18150 | 55980
| | | | 24 | 240 | 1560 | 8400 | 40824 | 186480 | 818520
| | | | | 120 | 1800 | 16800 | 126000 | 834120 | 5103000
| | | | | | 720 | 15120 | 191520 | 1905120 | 16435440
| | | | | | | 5040 | 141120 | 2328480 | 29635200
| | | | | | | | 40320 | 1451520 | 30240000
| | | | | | | | | 362880 | 16329600
| | | | | | | | | | 3628800
|
|